Legend:

So in comparison: S_PARTY holds the [ {the various {taxonomies, objects}}, users, capabilities, etc...] and each links to an extension table. Comparable to the POD model (i think i dont know it). This seems logical whether you call them PARTY or WP_THINGS.

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S_PARTY_REL holds all the defined relations between party's such as custom taxonomy 1 and custom taxonomy 2 (comparable to Mike's wp_relationships).

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S_PARTY_REL holds all the defined relations between party's such as custom taxonomy 1 and custom taxonomy 2 (comparable to Mike's wp_relationships but not fixed to defined types in the relation).

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S_PARTY_PER hold the relations where extra access control is needed e.g. between users and capabilities.